NEW Harddrive not recognized

So I installed a new 250gb internal HD in my 700 mHz eMac and its not showing up when I go to reinstall Tiger. It only shows up when I go under disc utilities, not as a destination to select to install the OS. What is going wrong?

So I installed a new 250gb internal HD in my 700 mHz eMac and its not showing up when I go to reinstall Tiger. It only shows up when I go under disc utilities, not as a destination to select to install the OS. What is going wrong?

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You need to Erase the drive first, using Disk Utility, which will format it ready for installation of the OS.

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